首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Between now(June) and Labor Day, millions of American will offer up their bodies to the sun’s rays. A tan indicates health and b
Between now(June) and Labor Day, millions of American will offer up their bodies to the sun’s rays. A tan indicates health and b
admin
2011-01-06
73
问题
Between now(June) and Labor Day, millions of American will offer up their bodies to the sun’s rays. A tan indicates health and beauty, and most sun worshippers will sacrifice a lot to achieve it—including themselves. With each hour, the sun’s ultraviolet radiation produces irreversible damage, hastening the development of unsightly wrinkles. And with each year on the beach or rooftop, the sunbather increases his risk of getting skin cancer.
Skin cancer is by far the most common form of cancer. An estimated 400000 new cases will be detected this year in the United States, and almost all of them can be blamed on overexposure to the sun. Fortunately, most of these cancers are highly curable. But they can be disfiguring and take time to treat. For that reason, sun worshippers should treat deity with a good deal of awe.
Sunburn, of course, is the initial hazard posed by UV radiation. Prolonged exposure to UV, however, interferes with the production of collagen fibers in the dermis, causing the skin to lose elasticity and creating premature wrinkles. Further deterioration of the dermis deprives the epidermis of nutrition and causes it to become thin and dry.
Cancer is UV’s final insult. Short-wave radiant energy, especially from the UV-B band, breaks the strands of DNA. Enzymes work constantly to rearrange the DNA into proper sequence, but with repeated UV exposure, the repair process may eventually break down. Then the mutant DNA may produce a colony of cancer cells.
But skin cancer may be avoided with a good dose of common sense. People with fair skin and blue eyes who burn easily stand the highest risk. Special danger spots are the parts of the body most constantly exposed to the sun, such as the cheeks, nose, lower lip and the ears. People who have already developed precancerous lesions or had one skin cancer growth stand a greatly increased chance of developing others. Dermatologists recommend avoiding the sun when it is most intense—between 11 a.m. and 3 p.m. Anyone who insists on sunbathing should use a good sun screen. These lotions and salves contain chemicals, such as paraaminobenzoic acid, that block out the burning UV-B radiation while permitting the tanning rays to reach the skin.
Which of the following comes first as a possible damage by UV radiation?
选项
A、Sunburn.
B、The loss of skin elasticity.
C、Dryness of epidermis.
D、The deterioration of dermis.
答案
A
解析
第三段 "Sunburn,of course,is the initial hazard posed by UV radiation”,先在文章中找到“UV radiation”,有关句子很容易发现。句意明白表示答案为A项。
转载请注明原文地址:https://kaotiyun.com/show/NEmd777K
本试题收录于:
职称英语卫生类B级题库职称英语分类
0
职称英语卫生类B级
职称英语
相关试题推荐
1.AreportconsistentlybroughtbackbyvisitorstotheUSishowfriendly,courteous,andhelpfulmostAmericansweretothem.
Whatdowethinkofwhenweheartheword"business"?Someofusthinkofourjogs,othersofthemerchantstheydealwithasco
Whatdowethinkofwhenweheartheword"business"?Someofusthinkofourjogs,othersofthemerchantstheydealwithasco
1.Moreandmore,theoperationsofourbusinesses,governments,andfinancialinstitutionsarecontrolledbyinformationthate
Readthefollowingarticleandchoosethebestwordforeachspace.Forquestions26-45,markoneletterA,B,CorDonyou
Readthefollowingarticleandchoosethebestwordforeachspace.Forquestions26-45,markoneletterA,B,CorDonyou
CONVERSATION2(Questions5-8)Fred’sjob:【L5】______driver.Yearsfordoingthejob:【L6】______.ProblemsFredhad:troublewith
OrderingRoomServiceRoomNo.:【L5】______Whatfordinner:twofreshJuices,oneorangeandone【L6】______,tworoastbeefsandw
Herculeswasthetallestmanintheworld.Herculesworkedintheking’sgarden.
StressCanMakeYouSickScientistsarenowstudyinganewfieldofresearchwhichiscalledpsychoimmunology(心理免疫学).Itisb
随机试题
造釉细胞瘤X线表现为中央性颌骨骨髓炎X线表现为
男性,20岁,心悸,多汗,手颤2个月,无明显突眼,甲状腺I度弥漫性肿大,血游离T3、T4增高,TSH降低。肝、肾功能正常,血WBC6.8×109/L。诊为甲亢。既往无甲亢病史,治疗应选择
关于股票基金,下列描述正确的是( )。
商品流通企业在开展经营活动和制订企业战略时,首先要()。
()是整个教育工作的核心,也是教育活动的依据和评判标准、出发点和归宿。
()神庙是古希腊雅典卫城建筑群中的主要建筑,是世界艺术史上最完美的建筑典范之一。
约翰逊称她于1907年创办的费尔霍普学校为()。
•Readtheextractbelowfromtheannualreportofabedmanufacturer.•Inmostofthelines(41-52)thereisoneextraword.I
Readthetextbelowabouttipsonbusinessnegotiation.Inmostofthelines(41-52)thereisoneextraword.Iteitherisgra
A、Themanwastheonlysurvivorofanaircrash.B、Peopleonboardwerefrightenedandtriedtoescape.C、Themanhasalwaysbee
最新回复
(
0
)